Alphabets and email
One of the things I do in my job is to prepare html emails in many different languages, which are sent out by our web marketing bods. We’ve discovered that the text of emails in non-Latin writing systems often gets mangled in transmission, so to make sure the recipients can read the text, we send the emails in English with links to web pages containing text in the relevant languages.
Maybe one day you’ll be able to send emails in any language/writing system and be sure the text will display correctly at the other end. This doesn’t seem to be the case just yet.
I’ve also noticed that Latin transliterations are used by quite a few people who speak languages written with non-Latin writing systems in instant messages and other online chat and discussions. This may be because the systems don’t support of writing systems, or because they don’t always have the necessary input software and/or hardware to hand. Then again, some people might just find it easier to type quickly in the Latin alphabet.